Drawing device for spinning frames and for preparing machinery



June 9, 1931 I J, PFLIMLIN 1,809,251

DRAWING DEVICE FOR SPINNING FRAMES AND FOR PREPARING MACHINERY Filed Jan. 6, 1930 IN VEN TOR J I TTORNEY Patented June 9, 1931 Parentosrtes i JULES PFLIMLIN, or MULHOUSE, FRANCEL DRAWING nnvron Fort SPINNING FRAMES AND FOR PREPARING ACHINERY 7 Application filed January 6, 1930. Serial No. 418,711.

My invention relates to. sliver or roving drawing devices devised for the drawing effected by spinning frames andthe like, as alsobypreparatory machines and for drawingiframes. i

I have discovered, as disclosed by my U. S. Patent#1,7.49,156, datedMarch 4, 1930, that for the greatest efficiency the top' roll of the intermediate or middle pair should comprise 10 asleeve-like body so soft and supple that, as a result. of its own weight or of a supplementary weight, it will readily deform and con-V form to the surface of the fluted bottom roll of said pair, the resilience or. compressibility being in such high degree that the bottom roll is embraced by the toprollover a .comparatively large arc ofits circumferential surface. The object of the present invention is to simplify the construction and increase the softness of drawing rolls having the charac teristic feature of clasping the sliver-upon a comparatively great length, but under comparatively light pressure, and with only a restricted portion of the totalv pressure im-' parted to the sliver.- I

Tothe accomplishment of this object and such othersas may hereinafter appear,-as will readily be understood'by those skilled in the" art, the invention comprises the features and combinations of parts and processes of manufacture hereinafter described and then particularly pointed out in the appended claims;

The nature and scope ofthe invention will smooth and of long wearing quality. Askin I of soft'and flexible leather has long been used ontop rolls but this alone,'us,e d as a bridge betweenthe collars of the arbor would not be best be understood from a description of the preferred embodiment thereof illustrated in the accompanying drawings,in which:

Figure 1, is a View, in perspective, of, the cot or flexible skin cover for the drawing-roll; Fig.2 is a like view of the deformable 40 backing, preferably soft rubber;

I Fig. 3 shows the parts'of F'gs. 1 and 2 after assembly; to form a reinforced, but still supple, sleeve;

Fig. 4: shows a metalarbor, of the collar type,having two of mynovel drawing sleeves secured thereon in a manner to produce soft and flexible rolls; and

Fig. 5 illustrates a spinning frame showing the belt-like contact between my novel roll and the co-acting, flutedbottom roll.

provides a single, unbroken air chamber be- .neath the entire length of the effective or lowing description.

tothe-de'sired degree. Owing to thegrea tin- The metal arbor for my new drawing roll is of the type having a pair of spaced collars 10 '.10 of greater'diameter than 'the intermediate shaft 12. In Fig.4 I have shown an arbor for two drawing rolls,=the-c ollars being I duplicated at each end' of-the arbor and the twin formation being connected by a central portion 14 of the shaft. The spacing of the collars and their diameter maybe varied to aclclommodate any desired size of drawing ro In the embodiment of the inventionillustrated in the drawing showing my invention I applied to the'middle top roll I form a flexi- .ble, tubular sleeve that spans or bridges the v space between two collars 10 onthe arbor. The sleeve, while concentric to the axis of the 1 arbor, has n'oradial support except-at its ends. The smaller diameter of the shaft 12- working portion of the completed roll. This v .air cushion, in effect, gives toythe-tubular sleeve a material elastic thickness, because the air chamber supports the sleeve solightly thata very inconsiderable pressure will cause .it to deform oricushion. :Tl1e s uppleness of the roll is thus considerably increased over deformable rolls that depend-upon a material thicknessof elastic materialvand this leadsto other advantages that will appear in the fol- The surface of the middleitop rolls must be effective because of its natural abilityto stretch. The top roll,forbest results and long life, should be substantially resilientor ing or interior 1 reinforcement -18 of materialthat will impart to the sleevethelcushioning quality :of elasticity, resiliency or suppl'eness 9o have the quality of regaining its cylindrical crease in suppleness of the completed roll, due to the air cushion, it is possible to use a cot or sheath 16 of greater weight or thickness which gives the roll greater wearing qualities without detracting from its effectiveness in progressively deforming as it rotated against a bottom roll and under working conditions and clasping the sliver against a considerable portion of the circumferen,

outer wall of the rubber tube desirably being first roughened as by buffing. Tn the illustrated form of the reinforced sleeve the length of the leather cot is somewhat greater than the distance between the outer faces of the pair of arbor collars 10, and the length of the rubber backing is such that it provides substantially a bridge across the space be tween said collars. I preferably make the flexible backing twice as thick as the sheathing cot. It is within the scope of my invention to vary the materials and/or the dimensions of these parts as may be found desirable in practice. The inside diameter of the tube '18 is somewhat greater than that of the collars 10, in practice about inch. The sleeve may thus easily be slipped into place onthe arbor. Since the tube 18. contacts the inner surface of the cot. 16' the inside diameter of the extended ends of the cot is considerably greater than the diameter of the collars 10. It is requisite, therefore, that the skin form ing'the. two ends of the type of sleeve illusofthe tube 18 thus forming shoulders which trated by Fig. '3 be contracted, as by shrinkmg, in order to fit on the two collars. The ends of the sleeve may be shrunk to an inside diameter equalling the collar diameter either before or after it has been slipped on the arbor. To secure the sleeve in place the collars may be coated with adhesive and a firm joint is made by shrinking with a hot iron. Excess length of the cot, if any, maythen be trimmed even with the outer surfaces of the collars. g

In the preferred construction of the sleeve the backing tube 18 is not longer than the shaft 12 of the arbor'so that when the ends of the sheath 16 are shrunk the skin material is drawn down across and covers'the ends define a central or working portion of the sleeve of greater diameter than its end portions. It will be seen from Fig. 4 that the rubber backing is held out of contact with the collars by the shrunk ends of the cot so that complete lengthwise portions of its surface may be moved in by pressure without being obstructed. Its inherent elasticity moves it out when the pressure is relieved. When the top roll is pressed against its coacting roll, i. e. the generally fluted middle bottom roll 20 5) this enlarged or over-sized working portion of the sleeve will be uniformly deformed throughout its length by depression of the elastic backing into the annular air chamber therebeneath in a manner to enable the top roll to embrace several flutes of the co-acting roll with a belt-like engagement. This movement is permitted because there is greater flexibility at the ends of the circumferential wall that comprises the working portion than throughout said working portion itself. walls of the sheath thatare downturned over the endsof the reinforcement provide weaker end sections where the sleeve engages the arbor causing the sleeve to simulate a bellows, its stiffer or stronger working portion moving in and out freely on these flexible joints. This action is shown by Fig. 5 wherein, it will be observed, the depth of the deformation is less than the difference in the diameters of the skin covered collars and the enlarged working portion so that the only contact between the two rolls is by the medium of the deformable sleeve. The most desirable and effective control of the sliver by light pressure over a substantial distance in the direction of its extent cannot be obtained in other sleeve forms where the diameter of the drawing roll is the same throughout the length of the sleeve because then the arbor collars must ride on the co-acting roll and only a line contact between the two rolls will be obtained.

My novel top roll may be saddle weighted according to well known principles, or it may be self weighted. For best results the depression of the reinforced and air-cushioned sleeve while in contact with the middle bottom roll is not more than 1 g of an inch. An air cushion having a depth of about of an inch, will amply care for this degree of deformation. Hence the shafts 12 may conceivably be made heavy enough to enable the metal arbor itself to effect this slight deformation in a top roll having such extreme flexibility and softness as herein described.

It will be understood from the foregoing description that the use of my drawing roll for other than middle top rolls is within the scope of my invention.

Reference is made to my co-pending application Serial No. 418,712 filed January 6, 1930, (a division of my application filed November 10, 1928, now United States Patent No. 1,749,398, March 4, 1980) in which will be found the claims which are generic to the subject-matter disclosed in this and said copending application.

While it is preferred to employ the specific construction and arrangement of parts shown and described it will be understood that this construction is not essential except so far as specified in the claims, and

may be changed or modifiedwithout depart other and secured to said collars at its ends,

' flexible and deformable material supported and a shorter flexible backing inside said sleeve and held thereby out of-contact with said collars, said sleeve and its backing lying out of contact, with said shaft and concentric to its axis.

2. In drawing devices for spinning frames and preparatory machinery a top roll comprising a workingportion formed by a hollow sleeve of flexible and deformable material between annular ends of even greater flexibility, an arbor shaft within saidsleeve of smaller diameter than the inside diameter of the sleeve to which said sleeve is secured by its ends forming a single annular air tubinglying within and substantially central of the length of the sheath, and the extended ends of the sheath being reduced in diameter about the ends of the rubber tubing;

7. In a drawing roll for spinning frames and the like, a flexible and deformable hollow sleeve having tubularnends of reduced diameter andv a central working portion of greater diameter,:said working portion having a wall that is relatively stiffer than said tubularends. i

,8. The method of making drawing rolls for spinning'frames and the like which comprises producing an arbor having spaced collars and an intermediate shaft, forming a sleeve by assembling a flexible tube, having a length substantially that of said shaft, centrally inside a sheath of flexible skin having having an inside diameter somewhat greater than the dlameter of sald collars, and secur ing said sleeve axially on the arbor by reducing the diameter of the extended ends of chamber between the sleeve and the shaft,

and a' co-acting roll acting to deform said when the top roll is pressed against said 00- V acting roll. I

3. A drawing roll for spinning frames and the like comprising an arbor shaft, spaced collars in said shaft, and a hollow sleeve of by its ends on said collars in spaced relation to said shaft, said sleeve having a working portion between said collars of greater diameter than its end portions forming a shoul- V der at each end of the working portion that I stands above said collars.

4. A drawing roll for spinning frames and the like comprising an arbor shaft, spaced collars on said shaft, a hollow tube of rubber having an inside diameter greater than that of the collars extending axially between said collars, and a sheath of flexible skin, within which said rubber tube is retained, having a length sufiicient to lap said collars and an inside diameter substantially equal to the outside diameter of said rubber tube, and having its ends secured to said collars.

5. A sleeve for, drawing rolls comprising a tubular sheath of flexible skin-having a substantially centralized inner reinforcement consisting of a shorter tube of flexible material.

6. In a drawing roll for spinning frames a length adapted to lap said collars, said tube 

